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PonyORM release 0.7.19 (2024-08-27)

Bugfixes

  • Add missed Python 3.12 classifier

PonyORM release 0.7.18 (2024-08-26)

Features

  • Add Python 3.12 support

Bugfixes

  • Fix #704 JSON handling in SQLite >= 3.45

PonyORM release 0.7.17 (2023-09-25)

Features

  • Add Python 3.11 support, drop support for Python < 3.8

Bugfixes

  • Fix #636 nullable IntArray and StrArray
  • Fix quoting table alias in MySQL DELETE queries
  • Fix handling of default argument values in hybrid methods and functions

PonyORM release 0.7.16 (2022-01-28)

Bugfixes

  • Fixes #628: DBAPIProvider.init() got multiple values for argument 'database'

PonyORM release 0.7.15 (2022-01-27)

Features

  • Add Python 3.10 support, drop support of Python < 3.6
  • You can create an in-memory SQLite database accessible from multiple threads by specifying ":sharedmemory:" as a file name

Bugfixes

  • Do not perform optimistic checks when deleting an object (it is OK if it was already deleted by concurrent transaction)
  • Validation of int fields should take into account field size and check that the value is fit into the range
  • More tests for hybrid methods added
  • Fix incorrect assertion check assert t is translator.
  • Fix aggregated query sum(x.field for x in previous_query)
  • #594: Use a clearly synthetic filename when compiling dynamic code to not confuse coverage.py
  • Use DecompileError exception instead of AssertionError when a function cannot be decompiled

PonyORM release 0.7.14 (2020-11-23)

Features

  • Add Python 3.9 support
  • Allow to use kwargs in select: Entity.select(**kwargs) and obj.collection.select(**kwargs), a feature that was announced but actually missed from 0.7.7
  • Add support for volatile collection attributes that don't throw "Phantom object appeared/disappeared" exceptions

Bugfixes

  • Fix negative timedelta conversions
  • Pony should reconnect to PostgreSQL when receiving 57P01 error (AdminShutdown)
  • Allow mixing compatible types (like int and float) in coalesce() arguments
  • Support of subqueries in coalesce() arguments
  • Fix using aggregated subqueries in ORDER BY section
  • Fix queries with expressions like (x, y) in ((a, b), (c, d))
  • #451: KeyError for seeds with unique attributes in SessionCache.update_simple_index()

PonyORM release 0.7.13 (2020-03-03)

This release contains no new features or bugfixes. The only reason for this release is to test our CI/CD process.

PonyORM release 0.7.12 (2020-02-04)

Features

  • CockroachDB support added
  • CI testing for SQLite, PostgreSQL & CockroachDB

Bugfixes

  • Fix translation of getting array items with negative indexes
  • Fix string getitem translation for slices and negative indexes
  • PostgreSQL DISTINCT bug fixed for queries with ORDER BY clause
  • Fix date difference syntax in PostgreSQL
  • Fix casting json to double in PostgreSQL
  • Fix count by several columns in PostgreSQL
  • Fix PostgreSQL MIN and MAX expressions on boolean columns
  • Fix determination of interactive mode in PyCharm
  • Fix column definition when sql_default is specified: DEFAULT should be before NOT NULL
  • Relax checks on updating in-memory cache indexes (don't throw CacheIndexError on valid cases)
  • Fix deduplication logic for attribute values

PonyORM release 0.7.11 (2019-10-23)

Features

  • #472: Python 3.8 support
  • Support of hybrid functions (inlining simple Python functions into query)
  • #438: support datetime-datetime, datetime-timedelta, datetime+timedelta in queries

Bugfixes

  • #430: add ON DELETE CASCADE for many-to-many relationships
  • #465: Should reconnect to MySQL on OperationalError 2013 'Lost connection to MySQL server during query'
  • #468: Tuple-value comparisons generate incorrect queries
  • #470 fix PendingDeprecationWarning of imp module
  • Fix incorrect unpickling of objects with Json attributes
  • Check value of discriminator column on object creation if set explicitly
  • Correctly handle Flask current_user proxy when adding new items to collections
  • Some bugs in syntax of aggregated queries were fixed
  • Fix syntax of bulk delete queries
  • Bulk delete queries should clear query results cache so next select will get correct result from the database
  • Fix error message when hybrid method is too complex to decompile

PonyORM release 0.7.10 (2019-04-20)

Bugfixes

  • Python3.7 and PyPy decompiling fixes
  • Fix reading NULL from Optional nullable array column
  • Fix handling of empty arrays in queries
  • #415: error message typo
  • #432: PonyFlask - request object can trigger teardown_request without real request
  • Fix GROUP CONCAT separator for MySQL

PonyORM release 0.7.9 (2019-01-21)

Bugfixes

  • Fix handling of empty arrays and empty lists in queries
  • Fix reading optional nullable array columns from database

PonyORM release 0.7.8 (2019-01-19)

Bugfixes

  • #414: prefetching Optional relationships fails on 0.7.7
  • Fix a bug caused by incorrect deduplication of column values

PonyORM release 0.7.7 (2019-01-17)

Major features

  • Array type support for PostgreSQL and SQLite
  • isinstance() support in queries
  • Support of queries based on collections: select(x for x in y.items)

Other features

  • Support of Entity.select(**kwargs)
  • Support of SKIP LOCKED option in 'SELECT ... FOR UPDATE'
  • New function make_proxy(obj) to make cross-db_session proxy objects
  • Specify ON DELETE CASCADE/SET NULL in foreign keys
  • Support of LIMIT in SELECT FROM (SELECT ...) type of queries
  • Support for negative JSON array indexes in SQLite

Improvements

  • Improved query prefetching: use fewer number of SQL queries
  • Memory optimization: deduplication of values received from the database in the same session
  • increase DBAPIProvider.max_params_count value

Bugfixes

  • #405: breaking change with cx_Oracle 7.0: DML RETURNING now returns a list
  • #380: db_session should work with async functions
  • #385: test fails with python3.6
  • #386: release unlocked lock error in SQLite
  • #390: TypeError: writable buffers are not hashable
  • #398: add auto conversion of numpy numeric types
  • #404: GAE local run detection
  • Fix Flask compatibility: add support of LocalProxy object
  • db_session(sql_debug=True) should log SQL commands also during db_session.exit()
  • Fix duplicated table join in FROM clause
  • Fix accessing global variables from hybrid methods and properties
  • Fix m2m collection loading bug
  • Fix composite index bug: stackoverflow.com/questions/53147694
  • Fix MyEntity[obj.get_pk()] if pk is composite
  • MySQL group_concat_max_len option set to max of 32bit platforms to avoid truncation
  • Show all attribute options in show(Entity) call
  • For nested db_session retry option should be ignored
  • Fix py_json_unwrap
  • Other minor fixes

Pony ORM Release 0.7.6 (2018-08-10)

Bugfixes

  • Fixed a bug with hybrid properties that use external functions

Pony ORM Release 0.7.6rc1 (2018-08-08)

New features

  • f-strings support in queries: select(f'{s.name} - {s.age}' for s in Student)
  • #344: It is now possible to specify offset without limit: query.limit(offset=10)
  • #371: Support of explicit casting of JSON expressions to str, int or float
  • @db.on_connect decorator added

Bugfixes

  • Fix bulk delete bug introduced in 0.7.4
  • #370 Fix memory leak introduced in 0.7.4
  • Now exists() in query does not throw away condition in generator expression: exists(s.gpa > 3 for s in Student)
  • #373: 0.7.4/0.7.5 breaks queries using the in operator to test membership of another query result
  • #374: auto=True can be used with all PrimaryKey types, not only int
  • #369: Make QueryResult looks like a list object again: add concatenation with lists, .shuffle() and .to_list() methods
  • #355: Fix binary primary keys PrimaryKey(buffer) in Python2
  • Interactive mode support for PyCharm console
  • Fix wrong table aliases in complex queries
  • Fix query optimization code for complex queries

Pony ORM Release 0.7.5 (2018-07-24)

Bugfixes

  • query.where and query.filter method bug introduced in 0.7.4 was fixed

Pony ORM Release 0.7.4 (2018-07-23)

Major features

Other features

  • distinct option added to aggregate functions
  • Support of explicit casting to float and bool in queries

Improvements

  • Apply @cut_traceback decorator only when pony.MODE is 'INTERACTIVE'

Bugfixes

  • In SQLite3 LIKE is case sensitive now
  • #249: Fix incorrect mixin used for Timedelta
  • #251: correct dealing with qualified table names
  • #301: Fix aggregation over JSON Column
  • #306: Support of frozenset constants added
  • #308: Fixed an error when assigning JSON attribute value to the same attribute: obj.json_attr = obj.json_attr
  • #313: Fix missed retry on exception raised during db_session.exit
  • #314: Fix AttributeError: 'NoneType' object has no attribute 'seeds'
  • #315: Fix attribute lifting for JSON attributes
  • #321: Fix KeyError on obj.delete()
  • #325: duplicating percentage sign in raw SQL queries without parameters
  • #331: Overriding len in entity fails
  • #336: entity declaration serialization
  • #357: reconnect after PostgreSQL server closed the connection unexpectedly
  • Fix Python implementation of between() function and rename arguments: between(a, x, y) -> between(x, a, b)
  • Fix retry handling: in PostgreSQL and Oracle an error can be raised during commit
  • Fix optimistic update checks for composite foreign keys
  • Don't raise OptimisticCheckError if db_session is not optimistic
  • Handling incorrect datetime values in MySQL
  • Improved ImportError exception messages when MySQLdb, pymysql, psycopg2 or psycopg2cffi driver was not found
  • desc() function fixed to allow reverse its effect by calling desc(desc(x))
  • contains method should check if objects belong to the same db_session
  • Fix pony.MODE detection; mod_wsgi detection according to official doc
  • A lot of inner fixes

Pony ORM Release 0.7.3 (2017-10-23)

New features

  • where() method added to query
  • coalesce() function added
  • between(x, a, b) function added
  • #295: Add _table_options_ for entity class to specify engine, tablespace, etc.
  • Make debug flag thread-local
  • sql_debugging context manager added
  • sql_debug and show_values arguments to db_session added
  • set_sql_debug function added as alias to (to be deprecated) sql_debug function
  • Allow db_session to accept ddl parameter when used as context manager
  • Add optimistic=True option to db_session
  • Skip optimistic checks for queries in db_session with serializable=True
  • fk_name option added for attributes in order to specify foreign key name
  • #280: Now it's possible to specify timeout option, as well as pass other keyword arguments for sqlite3.connect function
  • Add support of explicit casting to int in queries using int() function
  • Added modulo division % native support in queries

Bugfixes

  • Fix bugs with composite table names
  • Fix invalid foreign key & index names for tables which names include schema name
  • For queries like select(x for x in MyObject if not x.description) add "OR x.info IS NULL" for nullable string columns
  • Add optimistic checking for delete() method
  • Show updated attributes when OptimisticCheckError is being raised
  • Fix incorrect aliases in nested queries
  • Correctly pass exception from user-defined functions in SQLite
  • More clear error messages for UnrepeatableReadError
  • Fix db_session(strict=True) which was broken in 2d3afb24
  • Fixes #170: Problem with a primary key column used as a part of another key
  • Fixes #223: incorrect result of getattr(entity, attrname) when the same lambda applies to different entities
  • Fixes #266: Add handler to "pony.orm" logger does not work
  • Fixes #278: Cascade delete error: FOREIGN KEY constraint failed, with complex entity relationships
  • Fixes #283: Lost Json update immediately after object creation
  • Fixes #284: query.order_by() orders Json numbers like strings
  • Fixes #288: Expression text parsing issue in Python 3
  • Fixes #293: translation of if-expressions in expression
  • Fixes #294: Real stack traces swallowed within IPython shell
  • Collection.count() method should check if session is alive
  • Set obj._session_cache_ to None after exiting from db session for better garbage collection
  • Unload collections which are not fully loaded after exiting from db session for better garbage collection
  • Raise on unknown options for attributes that are part of relationship

Pony ORM Release 0.7.2 (2017-07-17)

New features

Bugfixes

  • Fixes #219: when a database driver raises an error, sometimes this error was masked by the 'RollbackException: InterfaceError: connection already closed' exception. This happened because on error, Pony tried to rollback transaction, but the connection to the database was already closed and it masked the initial error. Now Pony displays the original error which helps to understand the cause of the problem.
  • Fixes #276: Memory leak
  • Fixes the all declaration. Previously IDEs, such as PyCharm, could not understand what is going to be imported by 'from pony.orm import *'. Now it works fine.
  • Fixes #232: negate check for numeric expressions now checks if value is zero or NULL
  • Fixes #238, fixes #133: raise TransactionIntegrityError exception instead of AssertionError if obj.collection.create(**kwargs) creates a duplicate object
  • Fixes #221: issue with unicode json path keys
  • Fixes bug when discriminator column is used as a part of a primary key
  • Handle situation when SQLite blob column contains non-binary value

Pony ORM Release 0.7.1 (2017-01-10)

New features

  • New warning DatabaseContainsIncorrectEmptyValue added, it is raised when the required attribute is empty during loading an entity from the database

Bugfixes

  • Fixes #216: Added Python 3.6 support
  • Fixes #203: subtranslator should use argnames from parent translator
  • Change a way aliases in SQL query are generated in order to fix a problem when a subquery alias masks a base query alias
  • Volatile attribute bug fixed
  • Fix creation of self-referenced foreign keys - before this Pony didn't create the foreign key for self-referenced attributes
  • Bug fixed: when required attribute is empty the loading from the database shouldn't raise the validation error. Now Pony raises the warning DatabaseContainsIncorrectEmptyValue
  • Throw an error with more clear explanation when a list comprehension is used inside a query instead of a generator expression: "Use generator expression (... for ... in ...) instead of list comprehension [... for ... in ...] inside query"

Pony ORM Release 0.7 (2016-10-11)

Starting with this release Pony ORM is release under the Apache License, Version 2.0.

New features

Backward incompatible changes

  • #159: exceptions happened during flush() should not be wrapped with CommitException

Before this release an exception that happened in a hook(https://docs.ponyorm.com/api_reference.html#entity-hooks), could be raised in two ways - either wrapped into the CommitException or without wrapping. It depended if the exception happened during the execution of flush() or commit() function on the db_session exit. Now the exception happened inside the hook never will be wrapped into the CommitException.

Bugfixes

  • #190: Timedelta is not supported when using pymysql

Pony ORM Release 0.6.6 (2016-08-22)

New features

Backward incompatible changes

  • Dropped Python 2.6 support

Improvements

Bugfixes

  • #182 - LEFT JOIN doesn't work as expected for inherited entities when foreign key is None
  • Some small bugs were fixed

Pony ORM Release 0.6.5 (2016-04-04)

Improvements

  • Fixes #172: Query prefetch() method should load specified lazy attributes right in the main query if possible

Bugfixes

  • Fixes #168: Incorrect caching when slicing the same query multiple times
  • Fixes #169: When py_check() returns False, Pony should truncate too large values in resulting ValueError message
  • Fixes #171: AssertionError when saving changes of multiple objects
  • Fixes #176: Autostripped strings are not validated correctly for Required attributes

See blog post for more detailed information: https://blog.ponyorm.com/2016/04/04/pony-orm-release-0-6-5/

Pony ORM Release 0.6.4 (2016-02-10)

This release brings no new features, has no backward incompatible changes, only bug fixes. If you are using obj.flush() method in your code we recommend you to upgrade to 0.6.4 release.

Bugfixes

  • #161: 0.6.3 + obj.flush(): after_insert, after_update & after_delete hooks do not work

Pony ORM Release 0.6.3 (2016-02-05)

This release was intended to fix the behavior of obj.flush(), but failed to do it in a proper way. Please skip this release and update to 0.6.4 if you are using obj.flush() method.

Bugfixes

  • Fixes #138 Incorrect behavior of obj.flush(): assertion failed after exception
  • Fixes #157 Incorrect transaction state after obj.flush() caused "release unlocked lock" error in SQLite
  • Fixes #151 SQLite + upper() or lower() does not work as expected

Pony ORM Release 0.6.2 (2016-01-11)

The documentation was moved from this repo to a separate one at https://github.com/ponyorm/pony-doc The compiled version can be found at https://docs.ponyorm.com

New features

  • Python 3.5 support
  • #132, #145: raw_sql() function was added
  • #126: Ability to use @db_session with generator functions
  • #116: Add support to select by UUID
  • Ability to get string SQL statement using the Query.get_sql() method
  • New function delete(gen) and Query.delete(bulk=False)
  • Now it is possible to override Entity.init() and declare custom entity methods

Backward incompatible changes

  • Normalizing table names for symmetric relationships
  • Autostrip - automatically remove leading and trailing characters

Bugfixes

  • #87: Pony fails with pymysql installed as MySQLdb
  • #118: Pony should reconnect if previous connection was created before process was forked
  • #121: Unable to update value of unique attribute
  • #122: AssertionError when changing part of a composite key
  • #127: a workaround for incorrect pysqlite locking behavior
  • #136: Cascade delete does not work correctly for one-to-one relationships
  • #141, #143: remove restriction on adding new methods to entities
  • #142: Entity.select_random() AssertionError
  • #147: Add 'atom_expr' symbol handling for Python 3.5 grammar

Pony ORM Release 0.6.1 (2015-02-20)

  • Closed #65: Now the select(), filter(), order_by(), page(), limit(), random() methods can be applied to collection attributes
  • Closed #105: Now you can pass globals and locals to the select() function
  • Improved inheritance support in queries: select(x for x in BaseClass if x.subclass_attr == y)
  • Now it is possible to do db.insert(SomeEntity, column1=x, column2=y) instead of db.insert(SomeEntity.table, column1=x, column2=y)
  • Discriminator attribute can be part of the composite index
  • Now it is possible to specify the attribute name instead of the attribute itself in composite index
  • Query statistics: global_stats_lock is deprecated, just use global_stats property without any locking
  • New load() method for entity instances which retrieves all unloaded attributes except collections
  • New load() method for collections, e.g. customer.orders.load()
  • Enhanced error message when descendant classes declare attributes with the same name
  • Fixed #98: Composite index can include attributes of base entity
  • Fixed #106: incorrect loading of object which consists of primary key only
  • Fixed pony.converting.check_email()
  • Prefetching bug fixed: if collection is already fully loaded it shouldn't be loaded again
  • Deprecated Entity.order_by(..) method was removed. Use Entity.select().order_by(...) instead
  • Various performance enhancements
  • Multiple bugs were fixed

Pony ORM Release 0.6 (2014-11-05)

  • Fixed #94: Aggregated subquery bug fixed

Pony ORM Release Candidate 0.6rc3 (2014-10-30)

Bugfixes

  • Fixed #18: Allow to specify size and unsigned for int type
  • Fixed #77: Discriminate Pony-generated fields in entities: Attribute.is_implicit field added
  • Fixed #83: Entity.get() should issue LIMIT 2 when non-unique criteria used for search
  • Fixed #84: executing db.insert() should turn off autocommit and begin transaction
  • Fixed #88: composite_index(*attrs) added to support non-unique composite indexes
  • Fixed #89: IN / NOT IN clauses works different with empty sequence
  • Fixed #90: Do not automatically add "distinct" if query.first() used
  • Fixed #91: document automatic "distinct" behaviour and also .without_distinct()
  • Fixed #92: without_distinct() and first() do not work together correctly

New features

  • size and unsigned options for int attributes link

Since the long type has gone in Python 3, the long type is deprecated in Pony now. Instead of long you should use the int type and specify the size option:

    class MyEntity(db.Entity):
        attr1 = Required(long) # deprecated
        attr2 = Required(int, size=64) # new way for using BIGINT type in the database

Pony ORM Release Candidate 0.6rc2 (2014-10-10)

Bugfixes

  • Fixes #81: python3.3: syntax error during installation in ubuntu 14.04

Pony ORM Release Candidate 0.6rc1 (2014-10-08)

New features:

  • Python 3 support
  • pymysql adapter support for MySQL databases

Backward incompatible changes

Now Pony treats both str and unicode attribute types as they are unicode strings in both Python 2 and 3. So, the attribute declaration attr = Required(str) is equal to attr = Required(unicode) in Python 2 and 3. The same thing is with LongStr and LongUnicode - both of them are represented as unicode strings now.

For the sake of backward compatibility Pony adds unicode as an alias to str and buffer as an alias to bytes in Python 3.

Other changes and bug fixes

  • Fixes #74: Wrong FK column type when using sql_type on foreign ID column
  • Fixes #75: MappingError for self-referenced entities in a many-to-many relationship
  • Fixes #80: “Entity NoneType does not belong to database” when using to_dict

Pony ORM Release 0.5.4 (2014-09-22)

New functions and methods:

  • pony.orm.serialization module with the to_dict() and to_json() functions was added. Before this release you could use the to_dict() method of an entity instance in order to get a key-value dictionary structure for a specific entity instance. Sometimes you might need to serialize not only the instance itself, but also the instance's related objects. In this case you can use the to_dict() function from the pony.orm.serialization module.

    • to_dict() - receives an entity instance or a list of instances and returns a dictionary structure which keeps the passed object(s) and immediate related objects

    • to_json() – uses to_dict() and returns JSON representation of the to_dict() result

  • Query.prefetch() – allows to specify which related objects or attributes should be loaded from the database along with the query result . Example:

      select(s for s in Student).prefetch(Group, Department, Student.courses)

  • obj.flush() – allows flush a specific entity to the database

  • obj.get_pk() – return the primary key value for an entity instance

  • py_check parameter for attributes added. This parameter allows you to specify a function which will be used for checking the value before it is assigned to the attribute. The function should return True/False or can raise ValueError exception if the check failed. Example:

    class Student(db.Entity):
        name = Required(unicode)
        gpa = Required(float, py_check=lambda val: val >= 0 and val <= 5)

New types:

  • time and timedelta – now you can use these types for attribute declaration. Also you can use timedelta and a combination of datetime + timedelta types inside queries.

New hooks:

  • after_insert, after_update, after_delete - these hooks are called when an object was inserted, updated or deleted in the database respectively (link)

New features:

  • Added support for pymysql – pure Python MySQL client. Currently it is used as a fallback for MySQLdb interface

Other changes and bug fixes

  • obj.order_by() method is deprecated, use Entity.select().order_by() instead
  • obj.describe() now displays composite primary keys
  • Fixes #50: PonyORM does not escape _ and % in LIKE queries
  • Fixes #51: Handling of one-to-one relations in declarative queries
  • Fixes #52: An attribute without a column should not have rbits & wbits
  • Fixes #53: Column generated at the wrong side of "one-to-one" relationship
  • Fixes #55: obj.to_dict() should do flush at first if the session cache is modified
  • Fixes #57: Error in to_dict() when to-one attribute value is None
  • Fixes #70: EntitySet allows to add and remove None
  • Check that the entity name starts with a capital letter and throw exception if it is not then raise the ERDiagramError: Entity class name should start with a capital letter exception

Pony ORM Release 0.5.3 (2014-08-12)

This release fixes the setup.py problem that was found after the previous release was uploaded to PyPI.

Pony ORM Release 0.5.2 (2014-08-11)

This release is a step forward to Python 3 support. While the external API wasn't changed, the internals were significantly refactored to provide forward compatibility with Python 3.

Changes/features:

  • New to_dict() method can be used to convert entity instance to dictionary. This method can be useful when you need to serialize an object to JSON or other format (link)

Bugfixes:

  • Now select() function and filter() method of the query object can accept lambdas with closures
  • Some minor bugs were fixed

Pony ORM Release 0.5.1 (2014-07-11)

Changes/features:

Before this release, if a text attribute was defined without the max length specified (e.g. name = Required(unicode)), Pony set the maximum length equal to 200 and used SQL type VARCHAR(200). Actually, PostgreSQL and SQLite do not require specifying the maximum length for strings. Starting with this release such text attributes are declared as TEXT in SQLite and PostgreSQL. In these DBMSes, the TEXT datatype has the same performance as VARCHAR(N) and doesn't have arbitrary length restrictions.

For other DBMSes default varchar limit was increased up to 255 in MySQL and to 1000 in Oracle.

Bugfixes:

  • Correct parsing of datetime values with T separator between date and time
  • Entity.delete() bug fixed
  • Lazy attribute loading bug fixed

Pony ORM Release 0.5 (2014-05-31)

  • New transaction model (link)
  • New method Query.filter() allows step-by-step query construction (link)
  • New method Database.bind() simplifies testing and allows using different settings for development and production (link)
  • New method Query.page() simplifies pagination (link)
  • New method MyEntity.select_random(N) is effective for large tables (link)
  • New method Query.random(N) for selecting random instances (link)
  • Support of new concat() function inside declarative queries
  • New before_insert(), before_update(), before_delete() entity instance hooks which can be overridden
  • Ability to specify sequence_name='seq_name' for PrimaryKey attributes for Oracle database
  • Ability to create new entity instances specifying the value of the primary key instead of the object
  • Ability to read entity object attributes outside of the db_session
  • Ability to use lambdas as a reference to an entity in relationship attribute declarations (link)
  • The names of tables, indexes and constraints in the database creation script now are sorted in the alphabetical order
  • In MySQL and PostgreSQL Pony converts the table names to the lower case. In Oracle – to the upper case. In SQLite leaves as is.
  • The option options.MAX_FETCH_COUNT is set to None by default now
  • The support of PyGreSQL is discontinued, using psycopg2 instead
  • Added pony.__version__ attribute
  • Multiple bugs were fixed
  • Stability and performance improvements

Pony ORM Release 0.4.9 (2013-10-25)

  • Database create_tables()/drop_all_tables() methods
  • Database.drop_table(name), Entity.drop_table(), Set.drop_table() methods
  • Database.disconnect() methods (allows SQLite files deletion after disconnection)
  • Pony now automatically enables foreign key checks in SQLite
  • Entity.exists(...) method added
  • distinct() function added: select((s.group, sum(distinct(s.gpa))) for s in Student)
  • Refactoring & bugfixes

Pony ORM Release 0.4.8 (2013-08-27)

  • Use standard transaction mode by default instead of optimistic mode
  • SELECT ... FOR UPDATE support added: select(...).for_update()[:]
  • UUID datatype support added
  • Automatic foreign key indexes generation
  • MySQL foreign key bug workaround added
  • Check_tables parameter of generate_mapping() is deprecated
  • Bug fixes

Pony ORM Release 0.4.7 (2013-06-19)

  • @db_session decorator is required for any database interaction;
  • support of pickling/unpickling (queries and objects can be stored in memcached);
  • lazy collections - don't load all the items if only one is needed;
  • datetime precision now can be specified;
  • multiple bugs were fixed.

Pony ORM Release 0.4.6 (2013-05-17)